12.8.1 Ignoring the Encoding Header Line

Keywords: ignoreencoding, interpretencoding

The MTA can convert various nonstandard
message formats to MIME using the YesCHARSET-CONVERSION.
In particular, the RFC 1154 format uses a nonstandard Encoding: header
line. However, some gateways emit incorrect information on this header line,
with the result that sometimes it is desirable to ignore this header line.
The ignoreencoding keyword instructs the MTA to ignore
any Encoding: header line.

Note –

Unless the MTA has a CHARSET-CONVERSION enabled,
such headers are ignored in any case. The interpretencoding keyword
instructs the MTA to pay attention to any Encoding: header
line, if otherwise configured to do so, and is the default.